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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    
        ol{
            list-style: none;
            margin: 0;
            padding: 0;
        }
    
    </style>
</head>

<body>


    <ol start="5">
        <li>a</li>
        <li>b</li>
        <li>c</li>
        <li>d</li>
        <li>e</li>
        <li>f</li>
    </ol>


</body>

</html>